Sorry for reporting against udev.

After a quick check, the problem is in wacom-tools, more exactly in the
udev rule created by wacom-tools :

Here is an extract of wacom-tools ubuntu diff 
( 
http://archive.ubuntu.com/ubuntu/pool/main/w/wacom-tools/wacom-tools_0.7.2-0ubuntu7.diff.gz
 )

+# udev rule for wacom tablets.
+
+KERNEL=="event[0-9]*", SYSFS{idVendor}=="056a", SYMLINK+="input/wacom"

Reopening bug for wacom-tools

** Changed in: udev (upstream)
       Status: Unconfirmed => Rejected

** Changed in: wacom-tools (Ubuntu)
       Status: Fix Released => Confirmed

** Summary changed:

- /etc/X11/xorg.conf should point to /dev/input/wacom instead of /dev/wacom and 
xserver-xorg-input-wacom should depend on wacom-tools
+ wacom-tools udev scripts should point to /dev/wacom instead of 
/dev/input/wacom

** Description changed:

- First bug
- At the moment on Ubuntu, /etc/X11/xorg.conf points wacom devices to 
/dev/wacom, which is not the right location. It should instead point to 
/dev/input/wacom, automatically created by udev after install of wacom-tools.
+ At the moment, udev scripts installed by package wacom-tools point to
+ /dev/input/wacom, whereas /etc/X11/xorg.conf points wacom devices to
+ /dev/wacom.
  
- Second bug : 
- xserver-xorg-input-wacom doesn't depend on wacom-tools, whereas users need 
wacom-tools installed to get an almost working configuration.
- Reason : wacom-tools provide udev scripts that creates a working symlink in 
/dev/input/wacom
- 
- Solving these two really small bugs would make Ubuntu ready for wacom
- tablets (at least the USB ones) without even any user intervention - a
- great feature.
+ As a result, Wacom USB tablets don't work in Ubuntu.

-- 
wacom-tools udev scripts should point to /dev/wacom instead of /dev/input/wacom
https://launchpad.net/bugs/40473

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